windows_indicator_removal_via_rmdir.yml

name: Windows Indicator Removal Via Rmdir
id: c4566d2c-b094-48a1-9c59-d66e22065560
version: 1
date: '2023-11-23'
author: Teoderick Contreras, Splunk
status: production
type: Anomaly
data_source:
- Sysmon EventID 1
description: The following analytic identifies a process execute rmdir commandline to delete files and directory tree. 
  This technique has been observed in the actions of various malware strains, such as DarkGate, 
  as they attempt to eliminate specific files or components during their cleanup operations within compromised hosts. 
  Notably, this deletion method doesn't exclusively require elevated privileges and can be executed by regular users or network administrators, 
  although it's not the typical approach used for file deletion.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes 
  where Processes.process = "*rmdir*" Processes.process = "* /s *" Processes.process = "* /q *"
  by Processes.process_name Processes.original_file_name Processes.process Processes.process_id
  Processes.process_guid Processes.parent_process_name Processes.parent_process Processes.parent_process_guid Processes.dest Processes.user 
  | `drop_dm_object_name(Processes)` 
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` 
  | `windows_indicator_removal_via_rmdir_filter`'
how_to_implement: The detection is based on data that originates from Endpoint Detection
  and Response (EDR) agents. These agents are designed to provide security-related
  telemetry from the endpoints where the agent is installed. To implement this search,
  you must ingest logs that contain the process GUID, process name, and parent process.
  Additionally, you must ingest complete command-line executions. These logs must
  be processed using the appropriate Splunk Technology Add-ons that are specific to
  the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
  data model. Use the Splunk Common Information Model (CIM) to normalize the field
  names and speed up the data modeling process.
known_false_positives: user and network administrator can execute this command.
references:
- https://malpedia.caad.fkie.fraunhofer.de/details/win.darkgate
tags:
  analytic_story:
  - DarkGate Malware
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: a process execute rmdir command to delete files and directory tree in $dest$.
  mitre_attack_id:
  - T1070
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 25
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.original_file_name
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_path
  - Processes.process_path
  - Processes.parent_process_id
  - Processes.parent_process_guid
  - Processes.process_guid
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1070/rmdir_delete_files_and_dir/rmdir.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog